The Hevajra Tantra is a non-dual,Yogini tantra of the late Mantrayana tradition of Buddhism which was composed in north-eastem India during the 8th century A.D. It was one of the principal later tantric cycles which were first introduced into Tibet during the late I 0th century A D. in a general reintroduction of the Buddhism there after the persecutions of the previous centtuy. The origins of the tantric Buddhist-Wisdom and Means method exposed in the Hevajra Tantra can be traced to the views found in the 1 st century A.D. Madhymaka works of Nagarjuna and the works of other Mahayana schools as well as through the tenets of the later, 6th-7th century A.D. Yoga tantra tradition. The method of the Hevajra Tantra was especially evolved from the views on the tantric Buddhist method found in the Guhya Samaja Tantra, the Manjusri Mulakalpa, the Tattva Samgraha and other Yoga tantra works. The Yogaratnamala known as the Hevajra Panjika (9th cent. A.D.) is a principal commentary of the Hevajra Tantra by the Maha Siddha and Pandit Krishnacarya. This English translation of a principal root Tantra together with a translation of a major commentary by a Maha Siddha offers an authentic insight into the radical bio-genetic and psychological views of the Yogi tradition of Mantrayana Buddhism. These two translations therefore highlight not only the sophisticated but controversial Buddhist tantric methods, which constitute the very essence of the Tibetan tantric method, but also provide an authoritative historical record of and testament to the unique and uninhibited classic, c. 5th cent. A.D. to c. I 13th cent. A.D. tantric period of Indian religious history.-Concealed Essence of the Hevajra Tantra, Farrow & Menon, Motilal, HC, 303pp, $24.95